Rotating hook



im. 249 W5@ M. JOSEPH 2,495,637

ROTTING HOOK Filed Feb. 6, 1946 IINVENTOR.

MICHAEL JOSEPH 'TTORNEY `atented Jan.. 24, 1950 Q-FFICE 6Claiins: l

Thepresentlnvention relates. to a sewing ma'- chine andmore particularly to the rotatinghook whiclrserves tolock the threadbrought through the clothby. theneedle Withthe bobbin thread. Inmachines of the type to which the present'in.- Vention applies, the rotating hook surroundsa bobbin on which thethreadis wound and serves to-carry the thread, brought through the cloth bythe, needle, around the bobbin in completing thestitoh. The bobbin of the present arrangement. isofthe short disc type, and is heldin a casing which itself is positioned in but free from the'. hook.

The hooks inithe type of machine to which .the present invention applies are subject to hard usesince in each stitch the thread of the needle is hooked by the hook, the operation repeating many, times a minute, particularly in high speed machines. As a result, the hook wears out and mustbe replaced and repaired. Itis usual for repair, men to substitute a new hook and send the` old one backv to the factory or shop for. repair. or to discardit entirely.

The presentinvention has for its aim a hook, construction whichcan readily be repaired withoutany diculty by the service or repair man. Theinvention may be applied to a type'of hook in` which theA pointof the hook is a permanent part-oithehook or in which the point is renewable.

The present invention will be more fullyunder`` stood. upon reading the specification setr forth below when taken in connection withthe. drawingsannexed hereto illustrating the embodiments of.l the :invention in .which-'- FigureY l shows a-view of the'inventionin-elevation.

Figure-2 shows a plan view of the device of' Eigurel'.

Figure 3.1shows' ai sectional View taken on` the line- 3--35of-Figure 2;

Figure 4' shows a perspective of a detail ofFig'- ure-1;

Eigure5 shows afmodication of the invention in a position corresponding to Figure 1.

Figure 6-shows` a plan View of the device of Figure 5.

Figure 7 showsv a sectional` view taken on the linev Inl of.Fig ure 6, and

Figure 8 shows a perspectiveofa detail'-o"l;ig ure 5.

In the form shown in Figures 1 to 4 inclusive, the body of the hook comprises a cut I witlashort, hollow, cylindrical collar 2' formed` at the bottomV ofthe cup'syminetrically positioned and extending outward thereof. This` construction is cornimtan'lyused and' is necessary to t into the vstandard sewing machine. At the open end of the cup there is a heavy ring 3 with an internal iii',

2l. seatl.4=. In-.the;form.shown.in Figuresl` to 4,1mclslvea .hookzorf p ont 5 is.formedV as a part of the ringl. Thisphookor point .atits endV projects slightly upwardandv` forward from. the top or lip edgeofjthe ringand isformed with an Voutwardly projecting. edge. 6' beneath which is an. inward recession 1'all" on.the;external side oflthe ring. The. endl" of "the hook or point is the termination of .thes'lotawhich extends vdownward .at anacute angle-towardthe base of thecup. The topsur'- face.of`the;r.ing,3 is cutlower than the point!! ofi' the rhook ,adjacent .the point .so` ythatthe .thread will' be caught bythe point 8 and pass down the slot.9.as;the. hook is rotatedon an axis concentric witlthemylindrical.collar 21 'Theaboyedesoription appliesto standard construction. In .the further. construction of. the vvdevice shownz.in.Figures ltoAinclusve, the` slot 9`in which. the threadfollows. is provided with a guardLor. guide Ilwhichis spaced away from therecess T andis mountedin the outer surface of; the ring. 3...

For. this. purpose .the ring 3 isrecessed iny its outer surface tothe shape. of the guard.. l0 so thatw-hen the, guard.. |.0 lies inthe recess, its outer. sur-face.. is flush. and continuous with the cylindrical outer. surface. of. the ring 3. The guard.. l il. is. arcuate in. shape. with an upwardly extending portion Il at'.v oneend. terminating in an. inwardly projecting, short angle elementv l2 whichitsfover a portion. of .the top. rim 130i the cup. I'lhebottom edge. of ytheguard l0 is, preferably level andf'the other. end. of. the guard may be slightly enlargedas indicatedv at i4, with acurve l5 Whi-ch;.may parallel'-the slot 9. The enlarged end'J4-isrnot.' aslarge atthe-end l I and its upper edgeas s'een-in;Figure 1, is below the.. edge of the lip of "the ring 3' so that the recess in whichthe guardsetswill hold.. the guard against any motion except falling outward. The. guard, l0 is held; in.. the recess by. twoscrewsv I6v and,v l1 in tlielargeend |.Iand'one.screw I8 in the smaller end of.; the guardjhreadinginto the. ring.` 3.

Theanglei memberv l2 tapersN at both. ends. of

itsvtop suracet'o. the surface of.the.rim of the ring 3'.thereb .y`A making a smoothv surface for the lip of. the.,cup

Inrthe. operation. of. themachine, the point 8 of. the.; hook. comes. between.. the. needle-1 andthe threacband'. asthe hook.. rotates, the thread' is carried; around the bobbin. into the. slot. 9 and' outiagaidwhereuponlt. is. freed as the. needle draws thea thread upward- In. one or both of these movements the thread. rubs against the gua-rd. lllnvhich. frequently. wears and must-be renewed.. Flor.. this purposeY the. screws.v I 6, |.1

and. liLmay, bej: remoy.ed;and.a; new guard substi tuted; The movement of the thread within thel guard is limited by a pin I9 which is threaded 60 into the inner surface of the guard and preferably adjustable by making a screw head slot 20 in the end of the threaded pin. The slotted end of the pin I9 engages a hole 2| through the ring 3 so that a complete bar is formed against the thread slipping past the normal recess 'l of the hook. This will prevent the thread from being caught between the surface of the ring 3 and the guard, if there is that tendency.

In the arrangement shown in Figures 5 to 8 inclusive, the construction of the hook is somewhat modied. Here the ring 30 is shaped as in Figure 1 except for the fact'that the point is not carried up in the same way as in Figure 1. The point 32 is formed as a part of the band 3| (Figure 8) with a side portion 33 which cornes against the ring 30 on the outsideabove the slot 34 and a top inwardly extending angle element 35 which lies over the edge of the rim of .the ring. The band 3l is itself slotted at 35 to conform to the slot 34 in the body of the hook. Otherwise the band 3| may be the same as the band i0 with an enlarged lend 3l having a hole whereby it is attached at one end to the body of the hook and an enlarged end section 38 having a lip 39 continuous with the element 35v ex,- tending over the top edge of the ring 30. A pin l0 may be'similarly used corresponding to the pin of Figure 4. l.

The point of the hook in the modification .of

Figures 5 to 8 is actually formed in the band but the top lip or flange :iS-35, the side support 33 and the point 32 actually t snugly against a similarly formed contourin the ring of the hook and furnish support for the band.

' A further improvement in the present invention is the method of attachment of the cap I over the shaft opening 42 at the base of the hook. The base 2 within the cupk I iscircularly grooved at 43 concentric with the hole 42 and the cap 4I has a downwardly extending ange i4 which sets 'in the groove. This is :a forced fit and inserted in place before the base is machined.

It may be mentioned that the band 3l of Figures 5-8 is made hush with the outer surface of the hook by recessing the ring 30 in a contour so that the outer surface of the band will be flush with the surface of the ring similarly as explained in connection with Figures 1-5.

It will be noted that both bands or guards I0 and 3| may be changed without removal or adjustment of the hook as a whole and this adds greatly to the saving of time and convenience in repairs.

Having now described my invention, IV claim:

l. In a rotating hook used in a sewing machine producing a lock stitch, the hook having a needle thread slot and a ring section at its rim .with an externally recessed area in and extending below the ring adjacent the needle thread slot provided in the hook, an arcuate band closely tting and spanning said externally recessed area, said band being disposed in said recessed area with its external surface flush with the'surface of the ring on the outside thereof, said handhaving a flat lower edge and :an upper edge with upwardly extending ends forming enlarged endsections, and screws set in said band and threading into said ring for holding said band in place in its enlarged end. sections.

2. In a rotating hook used in asewing machine producing a lock stitch, the hook having a needle thread slot and a ring section at its rim, ,with`,ar1

externally recessed area in and extending below the ring adjacent the needle thread slot provided in the hook, an arcuate band spanning said externally recessed area, said band being disposed in said recessed area with its external surface flush with the surface of the ring on the outside thereof, said band having enlarged end sections with a flat lower edge, one end section being wider than the other and means passing through said end sections into said hook for clamping said band to said hook, the larger end section having an inwardly extending ange fitting ilush over the rim edge of said ring.

3. In a, rotating hook used in a sewing machine producing a lock stitch, the hook having la needle thread slot and a ring section at its rim with an externally recessed area in and extending below the ring adjacent the needle thread slot provided inthe hook, an arcuate band spanning said externally recessed area, said band being disposed in said recessed area with its external surface iiush with the surface of the ring on the outside thereof, said band having enlarged end sections with a flat lower edge, one end section being wider than the other and means passing through said end sections into said hook for clamping said band to said hook, the larger end section having an inwardly extending pin extending transversely acrossvthe recessed area into the surface of the hook.

4. In a rotating hook used in a sewing machine producing a lock stitch, the hook having a needle thread slot and a ring section at its rim with an externally recessed area in and extending below the ring adjacent the needle thread slot provided in the hook, an arcuate band spanning said externally recessed area, said band having a portion formed asv an end of the hook with a flange extending over the rim of the ring and a side section fitting hush with the side of said ring.

5. In a rotating hook used in a sewing machine producing a lock stitch, the hook having a needle thread slot and a ring section at its rim with an externally recessed area in and extending below the ring adjacent the needle thread slot provided in the hook, an arcuate band spanning said externally recessed area, said band having enlarged ends recessed in the side of said ring, a portion of one of said enlarged ends being carried forward to form the point of said hook, said band having a slot, aligned with the slot in said hook.

6. In a rotating hook used in a sewing machine producing a lock stitch, the hook having a needle thread slot with a point formed on one side thereof, a removable band element spanning said slot and forming a covering shell over a portion of the hook, means securing said band to the side of said hook, the covering shell itself providing a point overlying and substantially covering the point of the hook.

MICHAEL JOSEPH.

REFERENCES CITED Myers Aug. 30, 1938 

